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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '335e26dd6df6bc5a5547535fbe8f9ea770142c32cde11cd1fc0cd4e0e66d08a5' 
  AND token = 'sjvY6GgcxhvBRdIuKR4Ipeu118ZovJg+Mrer3h6deNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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