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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f3d903f3b9487165326c3fd9c1c0e061a72ad6e7c439bc7bb9051f80d00ec23' 
  AND token = 'm3cOyk+38SicpfFmQ/Exls7aa11SH9kvYRyhWW9MrN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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