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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe92ca5103e21cfcb0d36734ffe085cc735f84328096a3a4bd6d0cbb26874533' 
  AND token = 'PUE469S5Uou8TDVNoODdPD9MpWRXILuvh6l3jOI3G/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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