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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '700939673ad06d513e253c6e97810a9c7388f4d77e6fafb51527f9a02c512074' 
  AND token = '6lvXLCELGwfEcx/96NuOhghlOxE5y2QGHkBvN3cZu8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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