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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caca739e8ab7974713490128c2308fe4b96c23d4054f2e76c46fa8864ba50515' 
  AND token = '6Ctaz8q1mlkp2C+XuTYHlhHLT7YPkWtaiWJKPBeu7SY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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