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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed534501082ad55174c62d6f62a765b6a6e4af830882a0ac558ddc3012b4f63f' 
  AND token = 'rfcAnZqAZl7ejVtriBM0gyAzFo2Uj+u9IwnJ3/x4bOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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