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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2479d38934719e2c81531e210abbcc32b62d422979f964111d4f522652c9de96' 
  AND token = '7t8LrPGziVD+2uNKMdvs4EMO3T5i8JAScWqx3MvGI2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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