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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95a8c0b7c6cb9bbf83ae73e32f17e4e8b244b6ec0fa6d0ad663fc5e026d0a908' 
  AND token = 'C6/ScOWyWxQnM+0kovpY6TBUie694UL81VwQ+ceCf3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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