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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9aa162264ccad479c2f8a61bc7151d1451a624cebf9cd774f68e4502a80512b' 
  AND token = '9YSkv9ImPFo7PW/Fsha/E9WlFj67b89fliduRpQNi0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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