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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34bacbbd7d5a75ddfcb2a2cd85b7907b3d0259ac3be1cee7f9bcbb295b0217f0' 
  AND token = '5nkk0zDF28hEWPh1W+28h/9nVzr3MJIxeQRf1ZDEXMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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