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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24f918cd77cbbdbaac029b6e8b7ef188a2278724c2e176be59fc52e78f3b7896' 
  AND token = 'gVKfPb7C9v8C2vDbFxytSvJCLL3g7DqP0dvXf1OpX7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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