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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7746b2f8504b450a6125eac67ca0e1dc00f1ff43bfe2788607a7ccc0c0f6d8d8' 
  AND token = 'M9cv9jUaGypf3vdiswM35eubxa7TDEhJdr0sYzdJp/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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