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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6081239f547b52d9a6d353d79c8f1a694b66745ae271b9e7dec0dab3ad888fe4' 
  AND token = '+MzO7VJQ/dkpC6T8maWDII1rQOtNL/0WvrvChCJV6Hk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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