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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07d9effce02e228e272e02d57c072fd5a850e8c163cc2081284e6f0c9fda6b30' 
  AND token = 'N45hDI1HketGFZ0oEU9ld8Px0czosAYE0wWJX/5pIdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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