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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be8e713691b6d2d882fdd252ae863adf607473741dc16dcda17f6b036eab3a2d' 
  AND token = '0s89jgOFxA3p+2zi3QAiJUkziUAuBozKLMtgW/7v3sQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}