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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90e60b0cf33ebdf5cc7a493f19ed8a7a6112dc50c18b383fb5eacd4632c17005' 
  AND token = 'nL1xNsEL//BdkZNAVhc1qDRAZa/Qr3Obz/6uzyDGUiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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