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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b04d3120f24a876dd620848b5d6b8fb4cf59ad305635c72f2523f248d3469e6' 
  AND token = 'yK55zTC2pr9NgtQBTdaAGu1WgWdgt2pDdRyS/s5MQv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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