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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4081e73e46c03da3182e70b4102d1867d4cc11e49897823aea106ea4f152c85a' 
  AND token = '730wh4wdsQ89OxGmqkTJwAUCoJ65qxz7CdpBQZi/Svs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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