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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4afc9ee7a1acb1ddd27e55f4a72457717336839e8d769ab90b5f3a52d7bdc0ef' 
  AND token = 'g2t/VNvpAR8iMR/HvVtDBgjHapOxqJ54niA2oUtMq58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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