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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd52d7c5ffda5d401c9deb3480d9ba1fe6668a5a30aa90e8b42534c7b49c370c' 
  AND token = 'aEs4q9fcIkD2Ys3EJLbeoiW/5YBItSLBTTtn25nvBaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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