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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68cc85ba7ef1530d34353802b381137f94e5a9f5747ebd6ebb149049dcf08149' 
  AND token = '8SMmw+Bi1ZYK7brWudA8UXhTCT/A34YH3BGlztlwfM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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