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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd7eebde31fe78a22a1090bf17a5c4607d1c0963ce852ec33c0c9254879c8084' 
  AND token = 'cOTHyQM1yMc0d8dUMtpqTfdx05p8JIDCmlTxW3kOSjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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