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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8c193866d6ce44b9b39444ef84cecb7e99e175d3ab98722ad71792f25c0c03e' 
  AND token = 'YPPps7T8hgV51gYkD19QIK70d49BrpslDbZRi7fy7Jw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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