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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9d335f45a6e9d72b9b30cd40be3f2dd02457a41f0efa8e3e7d07a113c3112a6' 
  AND token = 'iuuyz9a+SJ+QxM7Piwb6nnwE/5yp1C2te7UftlU9nDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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