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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9722fbaea2099dde6529a24d62d9284005fa9cced5c37b30f3b4858288929fd6' 
  AND token = 'EqQ1SRf3Ea0DsFEgOc/gnEldPaMazT6uSVuGUaKB3v8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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