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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19ee68561a259a957a906f13e5e9364c20ee7184493651038ccda32a968fff17' 
  AND token = '+MvaZopSnXKNfbMlwcU3Tfv8wa+F4/SwzlBDzUBx+2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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