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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '771795f6dd604b2ce0a34c3926d11ca7cf0c1febb9a92aefbef288824f10b81e' 
  AND token = 'LgXX48W1CpJ4ObChk/Tz/hu1ZgNlxXdZ/Vp499fkvd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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