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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd09f9ff09bf47e73a653887a944b15df3cd19c2b9560405ecaeaf21c3261390' 
  AND token = 'Zz8U92qLJIXJSAMIV8JvTbfkqP2Ft6XZQHu6ofMG9g8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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