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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3674d68abda7fefcf3a97ae4ee11693a811ab8a90d7161d963c8b564d388ccf5' 
  AND token = 'UA2Akpcc0SIGVQVGi1sBdLjyqCAJ7c8hqn1/J3qViHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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