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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42e2a487386093994f549e335bd111b47c7e1a0138ddf83ef33af39dbd383da3' 
  AND token = '2yK/UuPoP0OlDxiW6FdoM+9tNz1Kw+Tx6FlNg0YTP6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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