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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93cbfef44382f6194edea7fc5d3ae56734e61e2576c0f087b15af534beb67010' 
  AND token = 'JgLxTrrOAyj80wmjKOLnRYOgcvzK4266Yh8XjIqyL4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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