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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c236723c384e18693d785a9572bf27d88aee50c3fcba7b7e8e3c953981ded068' 
  AND token = '0RdKRBsnbPA0OoMvhmwLXhWvlgOGj7j5tF/3dyRb/GA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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