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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04be0a1b4e79f6b00609128707015b5635fab5f54861d99518b4a185a300d766' 
  AND token = 's/XKotQ22oCDtfSXsLQ3TxedrOx9IJ7HOsyjVuEs/+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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