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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e58efca7d5cd58a5540ab5c352d7be22cb78088bf920cf074471985e38cab909' 
  AND token = 'a0IudeZrlrHc8bW5XNOWphcn3g1+D8HzBA4wUZHTNpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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