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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df8d7c55229d33e8045c6ed1e31cc2a88d5a9a77d0e759b6b8f276f6c1dc828b' 
  AND token = 'dcTAxsNIE7avCE5DC5GFkRfutkSeSq+ENUWUCME6J4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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