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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a1ececd885f59eb35f6da412551ffee3bbcf9bc0163e916a6b8ccf87b7b36bf' 
  AND token = 'kDBRWCSVg2CtOQFTknbLuyleT33TWRmj+gb4g8AbWY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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