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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3dbdf53b0e326ee542b3c98ff77f68db2bd541fdb3b60a5ec616a0a7d214adf' 
  AND token = 'XmsHIUAD2fPpt1vbDuIrHxo3fcc3Y+kpcwxQmhXok/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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