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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7342712c606c11ebfa05c3d247f424513d3ec297dd3a0270a027e3783f4ce954' 
  AND token = 'lTZmUlvsRfQMazxVugqjD2ATFJjYkjNvoEW7pWOkKx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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