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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67b11c06ea706cf503016adb0d15cf263585a91d88be7f5a11dae95c87312334' 
  AND token = 'by6lLaF+uGC30UMaxEXV4gRO1iJq86bk9QL5DFojoe4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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