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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '134d4ee2f2bfd91847febf458bac4097c7f10aa213a63b0cdc69b720db076c87' 
  AND token = 'oxCAdc5166TqDC07RtpJeP6BYWOWZlHe4E1IsY+ePQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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