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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32f9bb77d546120569ed8c70b59e6a0b1b2136eac1a8b75aaf337b3d04c4212d' 
  AND token = 'wI09X4ErmELIPQmbM7gIMOfSQ+JsA11eZ1SUYmO6ALo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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