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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc2321862a056244707c1c50ca6f9ebc9850faf5b770023850ebe3267358db96' 
  AND token = 'mwcybRnHh3+pyCuBeu3t+ZRLO0RmhHuzvN02FPyBAls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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