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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82fb1c937607e264f591d8e2c1c0c3e3cf975b5045e7c03040d8a38a6d062b85' 
  AND token = 'WDQd00Nb8mvU0xNvykD35OjSQ97+p1FJviTkMmJO/tk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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