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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4fdb82c2943dafc6a50d98cb3675918cbf18a6492ef9962a620fb69d1f7fc72' 
  AND token = 'V/NQ3H5szclVfrKnT90jXFTD7LspUNlmTgjmtWbQoJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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