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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae2573c98a40dd267d92cf172fa31f300ff880fcfd1fde328f21156a0f0b5a4f' 
  AND token = '5XLWy4/emQF1D4NbvPgbgDrI58+0JHCxlYVXUmyJkNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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