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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de1cfaadebed074976280c14864f7cc2f451984a6830d693c7743be803f1fc11' 
  AND token = '7wsbiWuuM/U2bzyO7J8MrIXq7WkuGf7/fXmZuiDrmt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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