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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1214e6707757c3bfeb7ebf2e827cff150e9352468f8ff5f72c4c5d340696fa9b' 
  AND token = 's0stgNLwwbA/DS1u6/z6Exm05K/k9BXxCsRh85I4aHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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