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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bd7e6c6cd96bcfb9c4316241690af935981c0a1c0a8a92a1ce8afc7b115f4dd' 
  AND token = '7QVyKD/fycXQ7os7b82svDujqYRLkXJHClRmYMxxaek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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