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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72c2994fc480a7ad93d332e37552ec2bd25d4127a7934f6b2f4d79416326347b' 
  AND token = 'dYO5nlnRr7maowT4fFHlcKY9aQLe3UMQlnVX4GVNj6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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