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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df0fdd52faf16cb5a649a40af0ad2dbbfe0fa23afb9ed873e7ddec1b2dc8072c' 
  AND token = 'vwJfVHNC3Y9mEF9/8iju+f04+JC8k8iJtliZhuLFmWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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