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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61df317f25456964d76e87ce6bf97677945d3088d0e9e5881d6ea2512ad4bba8' 
  AND token = 'TcveYslw8AuiED1snFtnNERc0niw3B44ddR/nSv9a9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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