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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34b02aeb4e9ae6a3631314e0d7d5f57af1e084a5d613bae7a6c6d1f55166b7aa' 
  AND token = 'C8y18W/oGwtjyfKEZd2OTDhKKt9llNBjUfp2kiP1TIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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