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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f67b4a137ad0f7b5a94a6927b73eccf8dc23eabde7288f3b1cc02a274cd3d8a7' 
  AND token = 'C5AiXrM70RKiyq8T+hlULHOikKj/Bbpo91ysTsT0r4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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