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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94b2ac9621bfbe492c086ac7a47bb9993e943249f5b852749b008acaa1bafd6f' 
  AND token = '5CdYiY9wc8QnDPOCfWZei2uMmyMjkgrAEonL+Y4CBr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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