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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2aea208ea49a0726a9ca6ffa70367302a88234d91a7936f49ed5848d6e1e02bb' 
  AND token = 'ta+rXMc+kD4pWdcGb4zFFABTmmbAb2pjVPICntr1yGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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