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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb128c0ddf489cad1db325b3c4a40abf39381427050d48bdf085d8004d8c3a75' 
  AND token = 'ccCfzAlZdz3pGA13tJjTsQY8js7G7qePADjuDix8eek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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