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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1ef1b4c8a5a63ecd3ed95a8f9c0a59fcd1352912dbdb397816f4817def56d2a' 
  AND token = '2zOeqZyAJifF1fe2vebrvEvYDb0SYfPn7A+v1ciCvaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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