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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abf7d7fe60bf3cbf99ee74d4081aac5ae070f5cd918bf4b721b08206b8ac2b46' 
  AND token = 'IH7GfDZqoDenIPwsCNpfKVA3bvD1D6djz9SEB2hzkeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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