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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3715014577e6b015b07720442876b4787390eeb6b6c9cc830a04758d9f5b92d3' 
  AND token = 'B15OegHw86M/NaswfgcNsekSQh/Vw6P4zEKTIsXQMTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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