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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee0102bd2b0b71d5339093d49e8025d5fdfe0be24944eba6706bf0c58eb4df8e' 
  AND token = 'Rs7MMCdV74Y6DckvD9+7iBEMpWcAvpmPuyWnPksUjiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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