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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1608cb49b3b4628482d5bb4ba467f31e941a561c5409292c1a065eeb1f7bdf23' 
  AND token = 'sr90UNqDdL54DPoPa2eczqw+g588ZUfaWcpc628RSBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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