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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2bf1c64b40b4f5780821ab7d3eea5b910d95a2bcea336e10333d688b27a5fba' 
  AND token = 'UUP673v41ZffKlApo5bdKeNMR59sbkG67T5eyEVRJJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00074

JSON explain

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