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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dd4a69bfce50be261cc7605e40288d9c63bea27c2c40924f973f1eb765e4179' 
  AND token = '/f0+1j10OZJRSa0VngDaGzFql+or0NdacHaoYTz+TX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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