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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3a409089d94d2f3599bd499978992089d09c8c1e33c2a4086df6c0adfb8627f' 
  AND token = 'E6xLYteRel7eZP/99p3pm3RlOlGgAniqfAnCrhbMv+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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